R=0.063000 : DEF MIN =Arrojadite : PDF =34-149 : Deviation of the charge sum from zero tolerable. At least one temperature factor missing in the paper. The coordinates are those given in the paper but the atomic distances do not agree with those calculated during testing.The coordinates are probably correct. PDF 34-149, dickinsonite has Mn>Fe The thermal parameters are deposited in the business office, Mineralogical Society of America